There are at least two variations of the calibre L615: L615.2 and L615.3, You can find the version in your watch by looking at the engraving on the rotor.
The main differences are outlined in the chart below.
| Longines L615.2 | Longines L615.3 | |
| Base Movement | ETA 2895-1 | ETA 2895-2 |
| Jewel Count | 30 | 27 |
| Lift Angle |
53 degrees | 51 degrees |
Which version powers your watch will depend on the age of your watch. At this time, it is unknown which model/year the evolution from .2 to .3 occurred. Please post your watch model, caliber version and original date of purchase below if possible.
